Selling my app to businesses

I have a completed app and needs some advice. I want to sell my app to businesses who will then give the app (customized with the business logo) away for free to only their customers. The app is currently on Itunes and Google Play. Have you done something similar? Help me in learning how I can do this. (I already have companies who want it, just don't know how to deploy it)
Thanks for your help!